Sidelink Packet Duplication for URLLC in V2X
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Solution Overview
Problem
Existing V2X communication technologies, such as LTE eV2X and 802.11p DSRC, fail to meet the stringent Ultra-Reliable Low Latency Communications (URLLC) requirements for advanced New Radio (NR) V2X use cases due to challenges in network coverage, resource scheduling, and coexistence with other users in urban and high-speed freeway conditions.
Innovation Solution
Enhanced Mode 3 and Mode 4 operations are introduced to support sidelink communications by configuring and selecting resources over multiple Component Carriers (CCs) for Packet Duplication (PD), preventing packet collisions, and dynamically activating/deactivating PD based on Channel Busy Ratio (CBR) reporting and MAC layer control, ensuring seamless handovers and high reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing resource scheduling procedure (SR, BSR, SL Grants) is used, then network access nodes can allocate radio resources to V-UEs, but latency becomes high which precludes URLLC
Solution Approach 1:
The patent applies preliminary action by pre-configuring resource pools and pre-establishing scheduling frameworks before actual data transmission occurs. The network node pre-configures resource pools with appropriate scheduling parameters and the UE pre-preares scheduling requests within established frameworks, eliminating the need for real-time resource allocation procedures that cause high latency. This allows URLLC traffic to use pre-established scheduling paths with minimal delay.
2Adaptability or versatility
If V-UEs operate in different states (RRC Connected, RRC Inactive, RRC Idle), then network coverage can be extended, but inconsistent operation occurs among V-UEs within a given area
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting scheduling parameters and resource allocation strategies based on the operational state of V-UEs. The network node modifies scheduling parameters such as resource pool selection, scheduling timing, and allocation strategies according to whether UEs are in RRC Connected, Inactive, or Idle states. This allows the system to maintain operational consistency across different UE states while preserving the flexibility to serve diverse deployment scenarios.
3Adaptability or versatility
If Tx UEs select channels independently without coordination, then resource selection flexibility is improved, but packet collisions occur in shared resource pools
Solution Approach 1:
The patent applies feedback mechanisms where Tx UEs receive channel status information and scheduling decisions from the network node or other UEs, and adjust their channel selections accordingly. The system implements feedback loops where transmission outcomes are monitored and used to modify future channel selection decisions, preventing packet collisions while preserving the flexibility to select from multiple available channels. This feedback-driven approach ensures reliable transmission in shared resource pools.
Data Source
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AI summary
A Method at a transmitting Vehicle User Equipment (Tx V-UE). The method comprises: transmitting, to a Radio Access Network (RAN) a set of parameters comprising any one or more of: a capability of the Tx V-UE, V2X service information and channel information; receiving, from the RAN, any one or more of: a Sidelink Radio Bearer (SL-RB) configuration; an activation status of a primary Sidelink (SL) channel; –a respective activation status of one or more secondary SL channels, and at least one grant for SL radio resources associated with each activated SL channel; and transmitting, to a Receiving Vehicle User Equipment (Rx V-UE), duplicated packets using SL radio resources of the primary SL channel and the one or more secondary SL channels.